JPH0215859A - Horizontal centrifugal casting device - Google Patents

Abstract

PURPOSE:To simply and efficiently bring a double pipe having a high quality to centrifugal casting by sticking a cylindrical liner by a refractory binder to the inside surface of one end part in a rotary casting mold whose inside diameter is uniform extending over the overall length. CONSTITUTION:On both ends of a rotary casting mold 1 supported horizontally, annular molten metal stopping walls 2, 2 are provided, and the inside diameter between the molten metal stopping walls 2, 2 of the casting mold 1 is formed uniformly extending over the overall length. Also, a cylindrical liner 3 made of ceramics, etc., is stuck and placed on the inside surface of the casting mold 1 by a refractory binder 4 so as to be brought into contact with one molten metal stopping wall 2. In the horizontal centrifugal casting device, the casting mold 1 is rotated by a rotation driving roller 5. An outer layer 61 is formed by pouring a molten metal through a pouring gutter 7 from a pouring port 12 of the opposite side to the liner 3 of the casting mold 1. Subsequently, an inner layer 62 is formed by pouring a molten metal onto the liner 3 through a pouring gutter 71 from a pouring port 13 of the liner 3 side. Next, a double pipe 6 obtained in such a way is taken out by removing the molten metal stopping wall 2.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a horizontal centrifugal casting apparatus.

(Prior Art and Problems to be Solved) Conventionally, a mold for forming a double pipe by a centrifugal casting method, as shown in No. 4121, has an annular stopper wall ( 2) is removably installed. To cast a double pipe, first, one of the pouring ports (12) and (13) at both ends of the mold is placed in the rotating mold (1).
The molten metal for forming the outer layer of the double pipe (6) is poured into the mold (1) from the pouring gutter (7) inserted into the mold (2), and centrifugal force causes the molten metal to flow into a cylindrical shape along the inner surface of the mold (1). to form an outer layer (61).

Immediately before or after the inner surface of the outer layer (61) solidifies, molten metal for forming the inner layer of the double pipe is poured into the mold (1) from the pouring gutter (71) inserted into the other pouring port (13). pour.

The centrifugal force causes the molten metal to spread over the inner surface of the outer layer 71i2 (61) in a cylindrical shape to form an inner layer (62).

Once the molten metal has solidified, remove the stopper wall (2) and remove the outer layer (61).
The double tube (6) in which the inner layer (62) and the inner layer (62) are integrally overlapped is taken out.

When forming a double pipe using the above procedure, when pouring the molten metal for forming the inner layer, the molten metal falls directly onto the inner surface of the end of the already cast outer layer (61), so the falling part and The inner surface of the outer layer (61) in the vicinity is greatly eroded, and in this part,
Mixed layer (63
) is formed. Since the mixed layer has different characteristics from the other parts of the double tube, there was a problem in using the double tube.

In order to solve the above problem, a double tube has been formed using a centrifugal i8 sending device shown in FIG.

The above centrifugal casting apparatus has an annular recessed step (11) at one end of a cylindrical mold (1), and a cylindrical liner (3) between the step (11) and the stopper wall (2). ) is removably fitted.

To attach the liner to the rotating mold, insert the pouring gutter (7) into the pouring port (12) on the opposite side of the mold, and insert the pouring gutter (7) into the outer layer of the double pipe (
61) Pour the molten metal into the mold (1).

The molten metal spreads into a cylindrical shape along the inner surface of the mold (1) due to centrifugal force. The molten metal is poured until the inner surface height of the molten metal reaches the inner surface height of the liner (3).

Immediately or directly before the inner surface of the outer layer (61) formed by the pouring is solidified, the pouring port (13) on the liner (3) side
)? Insert J (71) and pour the molten metal for forming the inner layer of the double pipe toward the inner surface of the liner (3).

The liner (3) is made of a refractory material such as alumina, and will not melt even if molten metal falls directly onto it, and the molten metal will spread circumferentially along the liner (3) and toward the other end of the mold (1). The inner layer (62) is layered on the inner surface of the outer layer (61) to form an inner layer (62).

As mentioned above, the molten metal for forming the inner layer is the liner (3).
Since the receiver is stopped and spreads along the inner surface of the outer layer (61), a part of the outer layer (61) is largely eroded as described above, resulting in a mixed layer (63) of outer layer components and inner layer components.
The formation of is prevented.

However, the following problems still exist in the production of double-walled pipes using the centrifugal casting apparatus shown in FIG.

That is, the liner (
3), place a liner (
It is necessary to create an annular recess step (11) into which the mold 3) is fitted, which complicates the mold manufacturing work.

To form a normal single pipe using the mold (1), remove the liner (3) and insert an auxiliary liner (not shown) with an inner diameter matching the inner diameter of the mold (1) into the stepped portion (11). ), and there is no need to create a step on the inner surface of the mold (1).

The present invention reveals a centrifugal casting apparatus with a liner that can solve the above problems.

(Means for Solving the Problems) In order to achieve the above object, the centrifugal casting apparatus of the present invention is provided with annular stopper walls (2) (2) at both ends, and between the stopper walls (2) (2). A liner (3) is adhesively fixed to the inner surface of the rotary mold (1) having a uniform inner diameter in contact with one of the anti-slip walls (2) using a refractory binder (4). ing.

(Functions and Effects) As explained in the conventional example of FIG. 3, the role of the liner (3) is to prevent the formation of a mixed layer of inner and outer metals due to remelting of the outer layer metal.

In the present invention, the liner (3) is combined with the refractory binder (4).
Since it is adhesively fixed to the inner surface of the mold (1), there is no need to process a recessed step (11) for fitting the liner (3) to the inner surface of the mold (1) as in the conventional method.

In addition, the binder (4) that adheres the liner (3) to the inner surface of the mold (1) is exposed to the high heat of the molten metal and loses its adhesive strength within a relatively short period of time. It can be removed, and when forming a heavy pipe, the liner (
3), and there is no need to fill the recessed step (11) on the inner surface of the mold (1) with an auxiliary liner as in the conventional method.

(Example) As shown in FIG. 1, a cylindrical mold (1) is placed horizontally on a plurality of rotary drive rollers (5).

At both ends of the mold (1), as is well known, there are annular hot water stopper walls (
2) is removably provided.

The inner diameter of the mold (1) is formed uniformly between the two molten metal retaining walls (2) (2).

A cylindrical liner (3) is adhesively fixed to the inner surface of one end of the mold (1) in contact with the inner surface of the hot water stopper wall (2) with a refractory binder (4).

The liner (3) is made of ceramic and its thickness corresponds to the thickness of the outer layer (61) of the double tube to be formed.

The refractory binder (4) that adheres the liner (3) to the mold (1) can be, for example, colloidal silicon dioxide called colloidal silica.

However, first, the liner must be installed at the spout (on the opposite side from the part).
Insert the pouring gutter (7) into the outer layer (61) of the double pipe.
) is poured into the mold (1), and the molten metal spreads into a cylindrical shape along the inner surface of the mold (1) due to centrifugal force. The molten metal is poured until the inner surface height of the molten metal reaches the inner surface height of the liner (3).

Immediately before or after the outer layer (61) formed by pouring the metal solidifies, pour the molten metal for forming the inner layer of the double pipe onto the inner surface of the liner (3) from the pouring port (13) on the liner (3) side. Pour towards the target.

The liner (3) is made of ceramic and will not melt even if the molten metal falls directly onto it, and the molten metal will spread along the liner (3) in the circumferential direction and toward the other end of the mold (1), forming an outer layer (
61) to form an inner layer (62).

Once the molten metal has solidified, remove the stopper wall (2) and pull out the double pipe (6) together with the liner.

As shown in Figure 2, one end of the double pipe (6) is connected to the liner (3).
Correspondingly, the outer layer (61) is missing, and the end of the tube lacking the outer layer (61) is cut off and used as shown by the two-dot chain line.

When forming a single pipe, the liner (3) can be removed and used.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the centrifugal casting apparatus of the present invention, Fig. 2 is a sectional view of a double pipe formed by a mold with a liner, Fig. 3 is a sectional view of a conventional mold with a liner, and Fig. 71 is a sectional view of a double pipe formed by a mold with a liner. FIG. 3 is a cross-sectional view of a mold without the

Claims (1)

[Claims] [1] Annular stopper walls (2) (2) are provided at both ends of a rotary mold (1) supported horizontally, and a cylindrical stopper wall (2) is provided on the inner surface of the mold (1) in contact with one stopper wall (2). In a horizontal centrifugal casting machine equipped with a liner (3), the stopper wall (
2) A horizontal centrifugal casting device in which the inner diameter between (2) is uniform over the entire length, and the liner (3) is bonded to the inner surface of the mold (1) with a refractory binder (4).